Form sends an email, but without attachments

Hi there,
I'm having a problem with the form. I've created a rather complex form for a customer. At the bottom of the form there is an area for attaching files. When I click on the Browse Files button, the files appear and remain visible. After clicking on Submit button, there is a message that the form has been sent successfully. I receive the email but there are no attachments.
How can I fix this? This is urgent.
I've also noticed that the Cloud icon isn't displayed on the frontend of the site, whereas it is present on the backend.
Here is the link :
https://sudvetia.com/contact-2/demande-dinterpretation-dexamen-dimagerie-medicale-et-cardiologie
I can provide you with access to the FTP server and the site backend.
Thank you in advance for your help.
Alex

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